Working with Geospatial Indexes

1. Adding Geospatial Data

Command	Description
`GEOADD key [NX\|XX] [CH] lon lat member [...]`	Stored as sorted set with geohash scores

GEOADD shops -122.4194 37.7749 "sf" -73.9857 40.7484 "nyc"

Command	Returns
`GEOPOS key m [m ...]`	[lon, lat] arrays or `nil`

Command	Units
`GEODIST key m1 m2 [m\|km\|ft\|mi]`	Default `m`

Command	Returns
`GEOHASH key m [m ...]`	11-char geohash strings (standard)

Command	Description
`GEOSEARCH key FROMMEMBER m \| FROMLONLAT lon lat BYRADIUS r unit [WITHCOORD] [WITHDIST] [COUNT n [ANY]] [ASC\|DESC]`	Unified search 6.2+
`GEORADIUS` / `GEORADIUSBYMEMBER`	DEPRECATED use GEOSEARCH

Shape	Syntax
Box	`BYBOX width height unit`
Circle	`BYRADIUS r unit`

GEOSEARCH shops FROMLONLAT -122.4 37.77 BYRADIUS 5 km ASC COUNT 10 WITHCOORD WITHDIST

Command	Description
`GEOSEARCHSTORE dst src ... [STOREDIST]`	Persist results as sorted set

Command	Notes
`ZREM key member`	Geo keys are sorted sets; reuse ZSET commands

Property	Value
Coordinate range	Lon ±180, Lat ±85.05112878
Precision	~0.5m worst case (52-bit geohash)